Patent US4122368A successfully refreshed from Google Patents.
US4122368A
Expired / Lapsed
US
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Cathode ray tube with a corrugated mask having a corrugated skirt
Assignee: RCA Licensing Corp
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Filing: 1977-07-08
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Granted: 1978-10-24
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Expires: 1997-07-08
Abstract
Abstract The tube is improved by the shadow mask having an apertured active portion of parallel corrugations and integral corrugated skirt portions extending from the two opposite corrugated edges of the mask. In one embodiment, the skirt corrugations are equal in periodicity but of opposite phase to the mask corrugations.
Inventors
- 👤 Walter David Masterton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:52
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
In a shadow mask type cathode ray tube having an envelope the improvement comprising, a shadow mask having a corrugated apertured active portion of slit-shaped apertures aligned in columns wherein the peak-to-peak wavelength dimension of corrugations in the mask is at least twice as great as the spacing between aperture columns, and an integral bent-over corrugated skirt attached to the active portion only at peak regions of the corrugations of the active portion, the intersection of said skirt and active portion having slits between the peak regions of attachment, said skirt interconnecting the active portion to the envelope.
Claim 2
Dependent Claim
98 words
In a shadow mask type cathode ray tube having an envelope the improvement comprising, a shadow mask having a corrugated apertured active portion of slit-shaped apertures aligned in columns wherein the peak-to-peak wavelength dimension of corrugations in the mask is at least twice as great as the spacing between aperture columns, and an integral bent-over corrugated skirt attached to the active portion only at peak regions of the corrugations of the active portion, the intersection of said skirt and active portion having slits between the peak regions of attachment, said skirt interconnecting the active portion to the envelope.
Claim 3
Dependent Claim
25 words
The tube as defined in claim 1 wherein the corrugations of said skirt are of opposite phase relative to the corrugations of said active portion.
Claim 4
Dependent Claim
30 words
The tube as defined in claim 1 wherein inward corrugation peaks of the skirt are attached to corrugation peaks of the apertured portion closest to a screen of said tube.
Claim 5
Dependent Claim
25 words
The tube as defined in claim 1 wherein the corrugations of the skirt are of different peak-to-peak wavelength than the corrugations of the active portion.
Claim 6
Dependent Claim
26 words
The tube as defined in claim 1 wherein said tube includes a mask frame suspended within the envelope and the skirt is attached to the frame.
Claim 7
Dependent Claim
15 words
The tube as defined in claim 5 wherein the skirt is telescoped within the frame.
References Cited (Backward Citations)
US3109117A
Cited
US3585431A
Cited
US3923566A
Cited
US3872345A
Cited
US3944867A
Cited
US4072876A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |